I all... I'm a little late to this thread, but just about to book three lots of car hire for the family holiday in California, BA flights. I usually book cars through the Avis website, but it's far cheaper this time going through BA. My concern is whether our not I would still get the Avis Preferred benefits (collect and go, airport upgrades etc). I see there is a space for entering your Avis number in the booking process, so hoping the answer is 'yes'! Any experiences? Thanks.